Concealed Door Closer,Aluminum Door Closer,Door Stop Door weight: 45-75kgs Concealed Door Closer,Aluminum Door Closer,Door Stop1. Quality casting aluminum alloy body portected by quality varnish.2. Fine oil seal to prevent leakage of oil.3. Two hydraulic valves control two closing speed independently and hydraulically.4. With stop function5. Normal color: Golden, silver, bronze or and color ...